There are legitimate reasons to ask for a draw (stalemate, teambuilder mistakes, hax, repeated matchups against the same opponent, for example), but drawing because you don't want your opponent to lose ladder points is anti-competitive behavior and will not be tolerated. Also be aware that your opponent is under no obligation to grant you a draw, even if you want it for legitimate reasons. If your opponent says no to a request to draw, do not ask again.